Trane X1000 120/24VAC Transformer

Guy's I have a problem that I need your help with. The 120/24 VAC transformer primary side was shorted, so I first thought maybe something was wrong internally, but I found no shorts. I replaced the transformer today but check for any shorts before doing so, turn the heat on and everything was good, or so I thought. I went to the store and came back to find the new transformer shorted on the primary side too. I removed the transformer and checked with my multimeter and found nothing shorted. What could cause 2x transformers to go out? It was working fine, no problems. Any help is appreciated.

Trane X1000 120/24VAC Transformer

The control board in the furnace was toggling the red light on and off like normal. Do you think I should buy a new control tstat and transformer, with the thought being the honey well control as the suspected component knock out the transformer?

Trane X1000 120/24VAC Transformer

I'm not sure what all is on the low voltage side? I know the transformer supplies the 24VAC to the board, but not sure what really goes on inside the board.
What about the wires outside to the compressor? Can I isolate the problem by turning on the air instead of the heat? Just a thought, trying to think of a way to find the problem.